Blockchain-based data management system

Blockchain-based data management system

Glossary

Term Definition Blockchain A distributed database that uses cryptography to link blocks of data together to form an immutable record. Smart Contract A piece of code stored on the blockchain that is automatically executed when pre-set conditions are met. Distributed Ledger A database that is shared and synchronized between multiple nodes, each of which has a complete copy of the ledger. Metadata Data that describes data, such as creation time, modification time, author, etc. Timestamp Records the exact time when an event occurs, used to verify the order and authenticity of data blocks. Mining The process of verifying and adding new data blocks to the blockchain by solving complex mathematical problems. Node A computer connected to the blockchain network that participates in data verification and dissemination. Decentralized Application (Dapp) An application running on the blockchain that is not controlled by any centralized organization. Public Blockchain A blockchain network that anyone can join and participate in. Private Blockchain is a blockchain network controlled and managed by a specific institution, and participants need permission to join.

Short answer questions

How does blockchain technology ensure the immutability of data? Blockchain uses cryptography to link each data block to the previous data block to form a time chain. Any change to the previous data block will change its hash value, thus invalidating the entire chain.

What role do smart contracts play in blockchain data management systems? Smart contracts can automatically execute pre-set rules and agreements, such as data sharing, access control, and transaction settlement. They can improve efficiency, transparency, and security.

What is the use of metadata in blockchain data management systems? Metadata can provide contextual information about data, such as the source, owner, and access rights of the data. This can help users better understand and use the data.

How does timestamp help verify the authenticity of data in blockchain data management systems? Each data block contains a timestamp that records the time it was created. This can help verify the order and authenticity of the data and prevent data from being tampered with.

Explain the role of "mining" in blockchain data management systems. "Mining" is the process of verifying and adding new data blocks to the blockchain. Miners compete for the right to record accounts by solving complex mathematical problems and receive rewards.

What is the difference between public and private chains? Public chains are open to everyone and anyone can join and participate. Private chains are controlled by specific institutions and participants need permission to join.

What is the difference between decentralized applications (Dapps) and traditional applications? Dapps run on blockchains and are not controlled by any centralized institution. They are more secure, transparent and censorship-resistant.

Explain how blockchain data management systems can improve the efficiency of data sharing. Blockchain data management systems can eliminate the need for intermediaries and simplify the data sharing process. All participants can access the same, trusted copy of the data.

What are the advantages of blockchain technology in data security? Blockchain uses cryptography technology to protect data and distributes it on multiple nodes, making it more difficult to be hacked or tampered with.

Give an example of a blockchain data management system in real-world applications. Blockchain data management systems can be used in areas such as supply chain management, digital identity verification, and medical record storage. For example, in supply chain management, blockchain can track the origin and transportation process of products, improving transparency and traceability.